Crawling algorithms have been the subject of extensive research and optimizations, but some important questions remain open. In particular, given the unbounded number of pages available on the Web, search-engine operators constantly struggle with the following vexing questions: When can I stop downloading the Web? How many pages should I download to cover “most” of the Web? How can I know I am ...

Crawling algorithms have been the subject of extensive research and optimizations, but some important questions remain open. In particular, given the infinite number of pages available on the Web, search-engine operators constantly struggle with the following vexing questions: When can I stop downloading the Web? How many pages should I download to cover “most” of the Web? How can I know I am n...

The nymphal stage of whiteßy pests is important in terms of its relationship to pest management measures and virus epidemiology. Among the nymphal forms, the active Þrst instar, i.e., crawler, is the only mobile form of immature whiteßies. A study was conducted to determine any inßuence of vegetable plant species and temperature on net distance moved (between the egg site and Þnal resting site)...

The two significant tasks of a focused Web crawler are finding relevant topic-specific documents on the Web and analytically prioritizing them for later effective and reliable download. For the first task, we propose a sophisticated custom algorithm to fetch and analyze the most effective HTML structural elements of the page as well as the topical boundary and anchor text of each unvisited link...

A Web crawler is an important component of the Web search engine. It demands large amount of hardware resources (CPU and memory) to crawl data from the rapidly growing and changing Web. So that the crawling process should be a continuous process performed from time-to-time to maintain up-to-date crawled data. This paper develops and investigates the performance of a new approach to speed up the...

The plentiful content of the World-Wide Web is useful to millions. Information seekers use a search engine such as Google, Yahoo etc to begin their Web activity. Our aim is to make a search tool that is cost-effective, efficient, fast and user friendly. In response to a query, it should retrieve the most relevant information which has been stored into the database. It should also be portable, s...

We describe our ongoing work on world wide web crawling, a scalable web crawler architecture that can use resources distributed world-wide. The architecture allows us to use loosely managed compute nodes (PCs connected to the Internet), and may save network bandwidth significantly. In this poster, we discuss why such architecture is necessary, point out difficulties in designing such architectu...

This paper presents a focused web crawler system which automatically creates a minority language corpora. The system uses a database of relevant and irrelevant documents testing the relevance of retrieved web documents. The system requires a starting web document to indicate where the search would begin.

Definition A web crawler is a program that, given one or more seed URLs, downloads the web pages associated with these URLs, extracts any hyperlinks contained in them, and recursively continues to download the web pages identified by these hyperlinks. Web crawlers are an important component of web search engines, where they are used to collect the corpus of web pages indexed by the search engin...

It is well recognized that the Internet has become the largest marketplace in the world, and online advertising is very popular with numerous industries, including the traditional mining service industry where mining service advertisements are effective carriers of mining service information. However, service users may encounter three major issues – heterogeneity, ubiquity, and ambiguity, when ...